My problem; I can't get my Airport Extreme to work w/ any of my PCs (via wireless). I have an Extreme N w/ gigabit -- and using WPA/WPA2 security. Latest firmware. My MBP works perfectly fine, so does my iPod Touch and even my printer which connects via WiFi also (hp Photosmart D7460). However none of my PCs can connect, I already tried w/ 2 different Dell laptops a Toshiba laptop and a desktop. All are running XP and have all the updates etc... All connect and work fine to my Linksys WRT54G. Any suggestions?